org.mapdb.serializer

Class SerializerEightByte<E>

java.lang.Object

org.mapdb.serializer.SerializerEightByte<E>

All Implemented Interfaces:

java.util.Comparator<E>, Serializer<E>, GroupSerializer<E>

Direct Known Subclasses:

SerializerDate, SerializerDouble, SerializerLong, SerializerRecid

public abstract class SerializerEightByte<E>
extends java.lang.Object
implements GroupSerializer<E>

Field Summary

Fields inherited from interface org.mapdb.Serializer

BIG_DECIMAL, BIG_INTEGER, BOOLEAN, BYTE, BYTE_ARRAY, BYTE_ARRAY_DELTA, BYTE_ARRAY_DELTA2, BYTE_ARRAY_NOSIZE, CHAR, CHAR_ARRAY, CLASS, DATE, DOUBLE, DOUBLE_ARRAY, ELSA, FLOAT, FLOAT_ARRAY, ILLEGAL_ACCESS, INT_ARRAY, INTEGER, INTEGER_DELTA, INTEGER_PACKED, JAVA, LONG, LONG_ARRAY, LONG_DELTA, LONG_PACKED, RECID, RECID_ARRAY, SHORT, SHORT_ARRAY, STRING, STRING_ASCII, STRING_DELTA, STRING_DELTA2, STRING_INTERN, STRING_NOSIZE, STRING_ORIGHASH, UUID

Constructor Summary

Constructors

Constructor and Description
SerializerEightByte()

Method Summary

Modifier and Type	Method and Description
int	fixedSize() Returns the fixed size of the serialized form in bytes or -1 if the size is not fixed (e.g.
boolean	isTrusted() Returns if this Serializer is trusted to always read the same number of bytes as it writes for any given object being serialized/de-serialized.
protected abstract long	pack(E l)
protected abstract E	unpack(long l)
E	valueArrayBinaryGet(DataInput2 input, int keysLen, int pos)
java.lang.Object	valueArrayCopyOfRange(java.lang.Object vals, int from, int to)
java.lang.Object	valueArrayDeleteValue(java.lang.Object vals, int pos)
java.lang.Object	valueArrayDeserialize(DataInput2 in, int size)
java.lang.Object	valueArrayEmpty()
java.lang.Object	valueArrayFromArray(java.lang.Object[] objects)
E	valueArrayGet(java.lang.Object vals, int pos)
java.lang.Object	valueArrayPut(java.lang.Object vals, int pos, E newValue)
int	valueArraySearch(java.lang.Object keys, E key, java.util.Comparator comparator)
void	valueArraySerialize(DataOutput2 out, java.lang.Object vals)
int	valueArraySize(java.lang.Object vals)
java.lang.Object	valueArrayUpdateVal(java.lang.Object vals, int pos, E newValue)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.mapdb.serializer.GroupSerializer

nextValue, valueArrayBinarySearch, valueArraySearch, valueArrayToArray

Methods inherited from interface org.mapdb.Serializer

clone, compare, deserialize, deserializeFromLong, equals, hashCode, needsAvailableSizeHint, serialize

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

SerializerEightByte

public SerializerEightByte()

Method Detail

unpack

protected abstract E unpack(long l)

pack

protected abstract long pack(E l)

valueArrayGet

public E valueArrayGet(java.lang.Object vals,
                       int pos)

Specified by:

valueArrayGet in interface GroupSerializer<E>

valueArraySize

public int valueArraySize(java.lang.Object vals)

Specified by:

valueArraySize in interface GroupSerializer<E>

valueArrayEmpty

public java.lang.Object valueArrayEmpty()

Specified by:

valueArrayEmpty in interface GroupSerializer<E>

valueArrayPut

public java.lang.Object valueArrayPut(java.lang.Object vals,
                                      int pos,
                                      E newValue)

Specified by:

valueArrayPut in interface GroupSerializer<E>

valueArrayUpdateVal

public java.lang.Object valueArrayUpdateVal(java.lang.Object vals,
                                            int pos,
                                            E newValue)

Specified by:

valueArrayUpdateVal in interface GroupSerializer<E>

valueArrayFromArray

public java.lang.Object valueArrayFromArray(java.lang.Object[] objects)

Specified by:

valueArrayFromArray in interface GroupSerializer<E>

valueArrayCopyOfRange

public java.lang.Object valueArrayCopyOfRange(java.lang.Object vals,
                                              int from,
                                              int to)

Specified by:

valueArrayCopyOfRange in interface GroupSerializer<E>

valueArrayDeleteValue

public java.lang.Object valueArrayDeleteValue(java.lang.Object vals,
                                              int pos)

Specified by:

valueArrayDeleteValue in interface GroupSerializer<E>

valueArraySerialize

public void valueArraySerialize(DataOutput2 out,
                                java.lang.Object vals)
                         throws java.io.IOException

Specified by:

valueArraySerialize in interface GroupSerializer<E>

Throws:

java.io.IOException

valueArrayDeserialize

public java.lang.Object valueArrayDeserialize(DataInput2 in,
                                              int size)
                                       throws java.io.IOException

Specified by:

valueArrayDeserialize in interface GroupSerializer<E>

Throws:

java.io.IOException

valueArrayBinaryGet

public E valueArrayBinaryGet(DataInput2 input,
                             int keysLen,
                             int pos)
                      throws java.io.IOException

Specified by:

valueArrayBinaryGet in interface GroupSerializer<E>

Throws:

java.io.IOException

isTrusted

public boolean isTrusted()

Description copied from interface: Serializer

Returns if this Serializer is trusted to always read the same number of bytes as it writes for any given object being serialized/de-serialized.

MapDB has a relaxed record size boundary checking. It expects deserializers to read exactly as many bytes as were written during serialization. If a deserializer reads more bytes than it wrote, it might start reading others record data in store.

Some serializers (Kryo) have problems with this. To prevent this, we can not read data directly from a store, but we must copy them into separate byte[] buffers. Thus, zero-copy optimizations are disabled by default, but can be explicitly enabled here by letting this method return true.

This flag indicates if this serializer was 'verified' to read as many bytes as it writes. It should also be much better tested etc.

Specified by:

isTrusted in interface Serializer<E>

Returns:

if this Serializer is trusted to always read the same number of bytes as it writes for any given object being serialized/de-serialized

fixedSize

public int fixedSize()

Description copied from interface: Serializer

Returns the fixed size of the serialized form in bytes or -1 if the size is not fixed (e.g. for Strings).

Some optimizations can be applied to serializers with a fixed size.

Specified by:

fixedSize in interface Serializer<E>

Returns:

the fixed size of the serialized form in bytes or -1 if the size is not fixed

valueArraySearch

public final int valueArraySearch(java.lang.Object keys,
                                  E key,
                                  java.util.Comparator comparator)

Specified by:

valueArraySearch in interface GroupSerializer<E>